Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab11ceaed437c2e…

MALICIOUS

PDF

87.6 KB Created: 2021-09-08 05:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 821d38ec7c692b191f864f05b9e2d74e SHA-1: 90e34a1bce2df8643fdab4943cf5eb4118023f6f SHA-256: 8ab11ceaed437c2e0b64f233e5fe266beba66e8662d780e766e93fa130e27d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://midel.me/userfiles/file/87610474542.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a610a5a2fd7---takalafovobu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/tidilumod.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117677159956---pevor.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/27396694506.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9700c7a5d---19927368388.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/gekalupaw.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/82285906892.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/36922220983.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/esk5oli1lbl3c7quoclqso3mov/fajibatejugo.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210702214215_4c34mw.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2e96345fa6bd7f99f6becf7c1b73633c/biwameser.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/11512198976.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/32c1b6f765ad9584493e474f6a3d3934/70902866592.pdfIn PDF document text
    • https://ultralloy.net/upload/files/revoput.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/68003947909.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/tazijuboviromakakivik.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/surevunilumatudofe.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/64061715893.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9299ac4905cc6845cf3be87b62a34d09/luzifitidorado.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/32994177199.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/migafugopexidisi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e34a85953315daae6c8a8135de26f3b6/52709713213.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/90330673983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=historical+places+in+tamilnadu+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10872 bytes
SHA-256: 8bd2bacf0c318bc1b9df487a4e5148d6999b9efd88af3d37f7e1323f6032a1b1
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 17988 bytes
SHA-256: 54a5f7a30bff0d3468aa65a3da3196fd6709173b3820a52d138e9166d27150fc

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